Friedrich's Birth and Family Background -- His Youth in Vienna -- Student in Göttingen -- Assistant in Berlin -- Fritz's First Marriage -- Life in Berlin -- Emigration to U.K. and U.R.R.S. -- Professor in Kharkov -- The Beginning of the Great Trials -- The Years of Prison -- An Overview of the Situation in Central Europe -- More About Fritz and Konstantin -- A Few Other Physicists' Political Troubles -- Finally Out of Prison! -- Shaken by World-Wide Storms. Fritz's Second Family -- An Outline of the Early Development of Applied Nuclear Energy in Germany -- From Berlin to Ronneburg -- In Göttingen Again -- Houtermans' Third Family -- Fritz's Fourth Family: His Departure -- Houtermans' Scientific Work and Influence in Berne -- Why We Remember Him.